private static uint ExtractData(Expression src, Dictionary<string, LabelOffset> label_offsets,
out bool fits, string cur_label,
int cur_offset, int field_len, bool is_lit)
{
if (src is IntegerOperand)
{
int i = ((IntegerOperand)src).val;
return build_imm(i, field_len, out fits, is_lit);
}
else if (src is RegisterOperand)
{
RegisterOperand r = src as RegisterOperand;
if (regs.ContainsKey(r.val.ToUpper()))
{
fits = true;
return (uint)regs[r.val.ToUpper()];
}
else
{
string label = r.val;
if (label_offsets.ContainsKey(label))
{
if (label_offsets[label].Section != cur_section)
throw new NotImplementedException();
int v = label_offsets[label].Offset;
return build_imm(v, field_len, out fits, is_lit);
}
else
throw new Exception("Undefined label: " + r.val);
}
}
fits = true;
return 0;
}
private static Expression EvaluateOperand(Expression src, Dictionary<string, LabelOffset> label_offsets,
Section cur_section)
{
if (src == null)
return null;
MakeState s = new MakeState(label_offsets, cur_section);
// ExpandComplex already uses operands
if (src is Operand)
return src;
var v = src.Evaluate(s);
switch(v.Type)
{
case Expression.EvalResult.ResultType.Register:
return new RegisterOperand { val = v.strval };
case Expression.EvalResult.ResultType.Int:
return new IntegerOperand { val = v.intval };
case Expression.EvalResult.ResultType.Relocation:
return v.relocval;
default:
throw new NotImplementedException();
}
}